[poppler] KMP for search

[Johannes Buchner]

Hi!

I implemented the KMP search algorithm in [1] but I feel it doesn't
get attention. Please apply [2] and test it. 

[1] https://bugs.freedesktop.org/show_bug.cgi?id=8821
[2] https://bugs.freedesktop.org/attachment.cgi?id=36255

To be honest, the gain is small; I find it odd that the search
function is page-based and runs per block (sorry, I'm new to poppler).
It strikes me that no wrapped words can ever be found. 

Perhaps it would also make sense to put a '#pragma omp for' in front of
the whole-document search? (For those not familiar with OpenMP,
this simply parallizes the search over the available CPUs.)

Cheers,
Johannes

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